Anemometer



Patented dan. I3, 1925.

rist.

ANEMOMETER.

Application led October 19, 1922.

To all whom t may concern:

Be it known that I, ELIsHA N. FALES, a citizen of the United States, residing at Lake Forest, in the county of Lake and State of Illinois, have invented certain new and useful Improvements in Anemometers, of which the following is aspecification.

The object of this invention is to provide a simple and easily manufactured rotating member or blade for an anemometer such as an anemometerof the Caselli type.

More particularly my invention contemplates the provision of two aerofoils having flat sides to provide accurate datum lines to aid in the erecting and manufacturing.

Further objects will be more fully explained in the following description and claims. In the drawing Fig. 1 represents a front plane view of the anemometer fan.

Fig. 2 represents the two blades or aerofoils of the fan.

Fig. 3 is a side elevation of the fan and mounting showing the mounting in cross section.

Fig. 4 is a section on line 4-4 of Fig. 3.

Fig. 4a-is a modification showing a different cross section of the blade.

Fig. 5 is a modification showing the anemometer blades made integrally out of a single piece of metal or wood. y

Figure 6 is an end View of the fan and mounting. the mounting being shown in cross-section.

Numerals 1' and 2 represent the two `blades v of the anemometer. Blade 1 is provided with a plane surface 3 and blade 2 is provide-d with a plane surface 4. The opposite sides of the blades 5 and 6 respectively are given an arcuate shape as shown in Fig. 4. Each blade is provided with a semi-circular groove 7 in the plane surface side. and these two grooves exactly fit around the' shaft 8 which supports the blades. 9 is a bearing in any suitable support 10 providing a mounting for the anemometer blades. Holes 11 are provided in each blade and bolts 12 extend through these holes 11 and through holes in the shaft. 8 to secure the blades to.

their shaft.

The faces 6 of the blades, instead of being arcuate as shown in Fig. 4, may have any irritable aerofoil section such as shown in It will be evident that the fiat sides of the Serial No. 595,697.

blades provide surfaces of reference to aid in erecting and the manufacture of the blades. The grooves may be out truly at right angles to the edges by modern machinery and these grooves become the means of alignment about the axis. The number of revolutions in such anemometers may be recorded in the conventional manner or may be observed by having the blades painted or colored differently so that -the revolutions` may be studied either directly by the. eye or b-y the aid of a stroboscope. The low pitch causes a slow speed of rotation which is often highly desirable. Such an anemometer may be used for measuring the air speed of an airplane or may be inserted in a wind tunnel or otherwise fixedly placed for measuring air speed.

In Fig. 5 is shown a modification in which thel anemoineter vanes are machined out of a single piece of wood or metal or other suitable material. .A plane face 3 is first machined in the rough stock and this plane face then furnishes an accurate datum sur- I face so that the stock may be correctly held in place while the other flat surface 4 and the two arcuate surfaces 5 and 6 are machined, and the center hole drilled.

I claim:

1. Anf anemomter fan comprising two separate blades, each blade having a plane face extending substantially the length and breadth of the blade, and means for joining the blades together.

2. An anemometer device comprising two separate blades, each blade having a plane side provided with a groove, a shaft for supporting the blades. and means for connecting the blades and shaft so 'that the plane. sides of the blades lie in the same plane and the shaft fits within the grooves.

An aneinometer' device comprising a plurality of separate blades leach blade having a plane side provided with a semi-circular groove near one end thereof, a shaft adapted to t within they said grooves, and means extending through the shaft and blades for assembling the bladeswith the plane sides together and with the axis of the sha-ft and the plane sides of the blades all on the same geometric plane.

4. An anemometer device comprising a plurality of separate blades, each blade having a plane side provided with a groove near one end, the grooves being adapted to enclose a'supporting member and means 'for ra-lit-y of blades, each blade being provided 10 joining the blades and supporting member with a Hat surface, the length of the said together. l surfaces being nearly as great as the length- 5. An anemometer fan comprising a pluof the blades, the said lat surfaces being 5 rality of blades, each blade being provided substantially in -the same geometric plane.

with a Hat surface, the length of the said In testitmony whereof I aixmy signa- 15 surfaces being nearly as great as the length ture. of the blad. l

6. An anemometer fan comprising a plu- .ELESHA N. FALES. 

